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公开(公告)号：US2739259A
公开(公告)日：1956-03-20
申请号：US28114052
申请日：1952-04-08
Applicant: NEAT CLARENCE E
Inventor： NEAT CLARENCE E
IPC: H01J19/42
CPC classification number: H01J19/42 , H01J2893/0002
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